The innermost germ layer of an embryo that gives rise to the digestive system and related organs.
From Greek 'entos' (within) + 'derma' (skin). Though called a 'skin layer,' it's actually the deepest of three primary tissue layers in developing embryos.
When you were just a tiny embryo, you had three layers of cells, and the entoderm—the innermost one—became your stomach, lungs, and liver!
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